Hi jkbf06 and welcome to the Forum.
Have a look at this website, Sals Pure Breeds in Monmouthshire http://www.salspurebreedpoultryinwales.co.uk/
As well as purebred CLBs they hold some stock of Chalk Hill Poultry's Chalk Hill Blue, a blue egg laying cream legbar hybrid which Chalk Hill Poultry have developed, which several of our members have bought and like. The reason I'm recommending Sals Pure Breeds is because lots of us have been impressed by the standard of Chalk Hill Poultry birds and I'm sure that anywhere they send their stock will also be really good. Of course you will need to see for yourself but it might be worth checking out.
Wherever you go, it would be best to get two, rather than one, because it's always very difficult to integrate a single bird into an existing flock, she will always be the outsider and may well be bullied also.